Lab 2: Digital Input and Output with Arduino Boards - Courses

Part 2 – Fading 3 LEDS
3) Extend your circuit so that it includes 3 LEDs according to the diagrams below. (Sorry, all I had
were green wires). Notice Pins 9, 10, and 11 are all marked PWM.
4) The following code dims the 3 LEDs according to a pattern. For your convenience, a copy of the
code can be downloaded from the course website. Look at the code and make sure you know
what each line does.
Part 3 – Serial Communications
5) Up until now, the Arduino board has been operating on autopilot once you’ve uploaded the
program. In this step, you will be using Arduino’s Serial Communication feature. The code is
provided here and is available on the course webpage. Look at the code and make sure you
know what each line does.
Homework (Due Sept 13, 2007)
1) Find a good diffuser for your RGB LEDs (e.g. ping pong ball, Styrofoam, etc).
2) Change the code so that you can control the RGB values with multiple key presses. For example,
pressing ‘r’ 5 times will set the brightness to 50% (or brightness = 127) and pressing ‘r’ 10 times
will set it to 100% (or brightness = 255).
3) (Optional) Come up with other ways of controlling the colors of the LEDs using the keyboard.
Here’s your chance to be creative. You can show off to your friends next week. Example: Read
colors and set the appropriate RGB values like “orange” might set r=70%, g=50%, and b=0%.